Hi Tim, Thank you for your respond. Yes, I created many sessions. I am going to check them now. May be I forget to close them. Btw, there is an occasion where the memory allocated for the threads is freed. This is happened daily, as if, there is a cron job in jboss server. I said that this is a cron job, and not a normal garbage collection, since "the cleaner" works at certain time everyday. I have read the manual in jboss server and jboss messaging, but don't find anything about this. Do you know something about it? I think if I can configure "the cleaner" to run every 12 hours, my application will work fine. Thank you in advance. Best Regards, Hendra View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4133817#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...